Checked my compression
Checked my compression
Faack! 100-105psi
Bike runs fine
Time for a topend? Unknown hours on the motor
Bike runs fine
Time for a topend? Unknown hours on the motor
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
Im at about 300-400' it was very humid,id guess atleast 70%-80% temp was no more than 40f maybe even 35south central hoon wrote:just ride it.
anything below 100 start looking at a rebuild. jay lewis is right they'll run for a long time right around 100psi.
also, what is your elevation? temperature? these things will affect the reading as well.
Bob, I posted some pics in another thread, the intake is clean. I put a pipe on it a few weeks back, thought the exhaust was clean too. I need to reaseal the flange ill check it, but again I thought it was clean.
Im just kinda bummed, I want all my bikes to be at a certain level of repair and didn't want to break this one open yet.
How do the scallips effect a compression check? don't they act like a compression release at slow kick start speeds and then don't play as much a role in the higher rpms?
if two equal motors, in port timing and calculated compression, what would the measured difference be between a scalliped motor and one without?
What are the advantages of running without scalliped bore?
if two equal motors, in port timing and calculated compression, what would the measured difference be between a scalliped motor and one without?
What are the advantages of running without scalliped bore?
-
- Posts: 678
- Joined: February 22nd, 2008, 8:18 pm
I pulled the pipe of tonight and checked out the cylinder, as best as possible through the exhaust. Looks good, no grooves on the exhaust side of the piston or no groves in the bore.
I did notices some lines running up and down in the cylinder, but the were smooth when I got my finger in there.... so am I cool? Can I flex hone it?
I did notices some lines running up and down in the cylinder, but the were smooth when I got my finger in there.... so am I cool? Can I flex hone it?
-
- Posts: 4394
- Joined: July 4th, 2007, 6:57 pm
i been lost from the beggining. your concearned with compression so you want to run a ball hone through it ? what good will that do if your planing to re-use the old piston . if your that concearned just take the jug off and measure what you got. put it back together if everything specs ok. if not then put pc9 on there, its only $60. or get bore job and all new piston. 100psi aint ideal but the bike will still run fine and if the piston aint slopping then who gives a shit. like i said im pretty lost what your trying to do
The only thing you can't check by looking in the exhaust port is if the bridge is pinching/scoring the piston.Every 500 that I'v pulled the cylinder off that has been worked on by someone else, has not had the bridge relieved.
Lots of bike shops don't even know that 500 cylinders need this mod.
Pull off the cylinder and measure everything so you know where your at.
Lots of bike shops don't even know that 500 cylinders need this mod.
Pull off the cylinder and measure everything so you know where your at.
Keep it real, Keep it steel.
100hp honda wrote:i been lost from the beggining. your concearned with compression so you want to run a ball hone through it ? what good will that do if your planing to re-use the old piston . if your that concearned just take the jug off and measure what you got. put it back together if everything specs ok. if not then put pc9 on there, its only $60. or get bore job and all new piston. 100psi aint ideal but the bike will still run fine and if the piston aint slopping then who gives a shit. like i said im pretty lost what your trying to do
I never said a thing about reusing anything. Im just trying to redo the topend with out sending the jug out and missing a weekend of riding. I don't trust any of the local shops. So if the bore was clean, ie not scoredy plan was to pull the head on sunday, order a new piston rings gaskets etc, have that stuff Wednesday, hone it and pop it all back together.
Im slightly concerned with the 100 psi, id rather rebuild it and know what's what. The bike has a unknown history. I've rebuilt several topends but always sent away the jug, for nearly the cost of shipping I can get a 50 flex hone. My question was if that's kosher, not if I can reuse the stuff, im cheap ....but im not britt